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Calculate using the enthaly of formation,the enthalpy of combustion of methanol,CH3OH

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2CH3OH + 3O2 ==> 2CO2 + 4H2O
DHrxn = (n*DHfproducts) - (n*DHfreactants).
Look up delta Hf for CO2 and H2O and CH3OH, substitute into the equation I gave you above and calculate delta H for the reaction.
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